Activities in Biology [ Teens/Mature Teens ] - Provides interactive quizzes on topics such as cell biology, organ systems, ecology, and photosynthesis.

Biology In Motion [ Teens/Mature Teens ] - Online activities for learning biology, including animated cartoons, an evolution simulation laboratory, and drag-and-drop quizzes.

Biology Online [ Teens/Mature Teens ] - Online activities, labs and tutorials. Site available in Spanish.

The Biology Project [ Mature Teens ] - Has tutorials and problem sets for learning biochemistry, cell, developmental, human, and molecular biology, Mendelian genetics, and immunology.

Biotech Adventure [ Teens/Mature Teens ] - A site intended to teach users about biology and biotechnology. Includes some educational illustrations and animations that can be downloaded by teachers and other educators for use in their curriculum.

Common Teasers in Biology [ Kids/Teens ] - Offers a few facts such as how an insect breaths to why a chameleon can change it's color.

Cool Activities for Kids [ Kids/Teens ] - Features learning activities about plants, space geology, veterinary science, parasites, ecology, sea otters, pollen, and using a virtual telescope to view genetic material.

Cool Science For Curious Kids [ Kids ] - Fun and interactive site to help kids appreciate science. Why are snakes like lizards, and monkeys like moose? Find out here.

Discover the History of Life [ Teens/Mature Teens ] - Provides an introduction to phylogeny, geologic time, and evolution.

Diversity of Life Web Index [ Teens/Mature Teens ] - Links to information about each of the kingdoms and a glossary of terms.

Dr. Farabee's Online Biology Book [ Teens/Mature Teens ] - Well organized and illustrated general biology text from Estrella Mountain Community College, Phoenix, Arizona. Advanced, but very clearly explained and illustrated.

Electronic Naturalist [ Teens/Mature Teens ] - Information on North American animals and plants with illustrations, text, activities, and access to a naturalist.

eNature.com [ Teens ] - The complete nature and wildlife resource featuring the Audubon Guides to plants and animals, outdoor planner and destination guide, habitat Guide, eCards, and newsletters.

Fish Olympics [ Kids/Teens ] - Introduces the natural history of the sea through a fun game.

Forest Speaks Exhibit [ Teens/Mature Teens ] - Educational web version of the Visitor's Center exhibit at the Smithsonian Tropical Research Institute in Panama. Includes information on rainforest mammals, frogs, birds and plants.

The Guardians of the Millennium [ Kids/Teens ] - Describes microbiology, the rain forest and the possibility of extraterrestrial life. Also in French, German, and Spanish.

4-H Embryology [ Kids/Teens/Mature Teens ] - Includes guidelines for incubating and candling eggs, photos, movies, egg cam, and resources. Sponsored by the University of Nebraska Cooperative Extension.

I Can Do That [ Kids/Teens ] - Cartoon characters take you on a tour of cells, DNA, RNA and biological techniques.

Just for Kids Wildlife Page [ Kids/Teens ] - Read about moose, wild turkeys, mosquitos, hummingbirds, and bears. Learn about habitat and wildlife biology. Color a bat, falcon, warbler, or eagle.

Kids' Corner [ Kids ] - Learn about Louisiana wetlands, and the plants and animals that live there. Includes coloring pages, maps, and aerial photographs.

Living Things [ Teens/Mature Teens ] - A look at individual organisms, communities, populations, species, and ecological food webs.

National Institute of Environmental Health Sciences Kids Pages [ Kids/Teens ] - Games, music, brainteasers, and other activities that introduce children to the impact of the environment on health.

OceanLink [ Kids/Teens ] - Facts, in-depth articles, ask-a-scientist forum, archive of answers and newsletter on oceans and ocean life.

Online Biology Book [ Mature Teens ] - Provides concise information on all aspects of biology, from biochemistry and body systems to plants and history.

The Open Door Web Site [ Teens ] - A Natural Science reference site for middle school students. Includes topic chapters, facts and figures, questions and quizzes. Quick search and index search available, as well as an Internet guide.

Rader's Biology4Kids.com [ Teens/Mature Teens ] - Cells, microbiology, the scientific method, invertebrates, plants, and vertebrates. There is also an extensive section with examples of different species. Offers downloads and online activities.

Science For Kids [ Kids/Teens/Mature Teens ] - Offers news about plants, animals, and other life science issues. Also includes pop quizzes, and pictures. Site is available in Spanish.

ScienceBob.com [ Kids ] - Enter the world of Science Bob to try home experiments, visit his on-line lab and get answers to your science questions.

SeaWorld: Animal Information [ Teens/Mature Teens ] - Contains information books, quick fact sheets, and the small wonders that are born at SeaWorld.

The Temperate Rain Forest Canopy of the Pacific Northwest [ Kids/Teens/Mature Teens ] - Hidden picture of canopy critters, Ask Dr. Canopy, leaf and bark rubbings, poetry, and conservation tips.

Tree of Life Web Project [ Teens/Mature Teens ] - Classification of organisms. Has diagrams showing where all organisms fit into the evolutionary tree.

The Visible Embryo [ Kids/Teens/Mature Teens ] - Provides a visual journey through the stages of human development from conception to birth.

Whiteman Park: Kids Only!!! [ Kids ] - A nature reserve in Western Australia lets you look for a wallaby and colour a picture of native plants and animals.

Wildlife-Our Wild Neighbors [ Kids ] - Learn about wild animals through online fun and games.